Iivalvu zeglobe, iivalvu zesango, iivalvu zebhabhathane, iivalvu zokujonga, iivalvu zebhola, njl. zonke zizinto zolawulo eziyimfuneko kwiinkqubo ezahlukeneyo zemibhobho. Ivalvu nganye yahlukile ngenkangeleko, ulwakhiwo kunye nokusetyenziswa kwayo. Nangona kunjalo, ivalvu yeglobe kunye nevalvu yesango zifana ngandlela ithile ngenkangeleko, kwaye zombini zinomsebenzi wokunqumla kwipayipi, ngoko ke abahlobo abaninzi abangenanxibelelwano kangako neevalvu baya kuzibhidanisa zombini. Enyanisweni, ukuba uqaphela ngononophelo, umahluko phakathi kwevalvu yeglobe kunye nevalvu yesango mkhulu kakhulu.

1 Ulwakhiwo

Xa indawo yokufaka incinci, kufuneka uqaphele ukhetho. Ivalvu yesango ingavalwa ngokuqinileyo ngomphezulu wokutywina ngoxinzelelo oluphakathi, ukuze kufezekiswe isiphumo sokungavuzi. Xa uvula kwaye uvala,isiseko sevalvu kunye nomphezulu wokutywina isihlalo sevalvuZisoloko zinxibelelana kwaye zigudlana, ngoko ke umphezulu wokuvala kulula ukuwunxiba. Xa ivalvu yesango isondele ekuvalekeni, umahluko woxinzelelo phakathi komphambili nomva wombhobho mkhulu kakhulu, nto leyo eyenza umphezulu wokuvala ugugile ngakumbi. Ulwakhiwo lwevalvu yesango luya kuba nzima ngakumbi kunevalvu yeglobhu. Ngokwembono yembonakalo, phantsi kwe-caliber efanayo, ivalvu yesango iphezulu kunevalvu yeglobhu, kwaye ivalvu yeglobhu inde kunevalvu yesango. Ukongeza, ivalvu yesango ikwahlulwe yaba yisiqu esinyukayo kunye nesiqu esifihliweyo. Ivalvu yeglobhu ayinayo.

2 Umgaqo wokusebenza

Xa ivalvu yokumisa ivuliwe kwaye ivaliwe, luhlobo lwesiqu sevalvu esinyukayo, oko kukuthi, xa ivili lesandla lijikeleziswa, ivili lesandla liya kujikeleza linyuke lize liwe kunye nesiqu sevalvu. Ivalvu yesango ijika ivili lesandla ukuze isiqu sevalvu sinyuke sibuye siwe, kwaye indawo yevili lesandla ngokwayo ayitshintshi. Izinga lokuhamba kwamanzi lahlukile. Ivalvu yesango ifuna ukuvulwa ngokupheleleyo okanye ukuvalwa ngokupheleleyo, ngelixa ivalvu yokumisa ingatshintshi. Ivalvu yokumisa inemiyalelo echaziweyo yokungena kunye neyokuphuma; ivalvu yesango ayinazo iimfuno zokungena kunye nesikhokelo sokuphuma. Ukongeza, ivalvu yesango inezimo ezimbini kuphela: ukuvulwa ngokupheleleyo okanye ukuvalwa ngokupheleleyo. Ukuvulwa kwesango kunye nokuvalwa kwesango likhulu kwaye ixesha lokuvulwa kunye nokuvalwa lide. Ukunyuka kweplate yevalvu yevalvu yokumisa lincinci kakhulu, kwaye iplate yevalvu yevalvu yokumisa inokuma kwindawo ethile ngexesha lokuhamba kokulawula ukuhamba kwamanzi. Ivalvu yesango ingasetyenziselwa kuphela ukusika kwaye ayinayo eminye imisebenzi.

3 Umahluko ekusebenzeni

Ivalvu yokumisa ingasetyenziselwa zombini ukusikaUlawulo lokuphuma nokuphuma kwamanzi. Ukumelana kolwelo lwevalvu yokumisa kukhulu kakhulu, kwaye kunzima ngakumbi ukuyivula nokuvala, kodwa ngenxa yokuba ipleyiti yevalvu imfutshane ukusuka kumphezulu wokutywina, ukubetheka kokuvula nokuvala kufutshane. Ngenxa yokuba ivalvu yesango inokuvulwa ngokupheleleyo kwaye ivalwe ngokupheleleyo, xa ivuliwe ngokupheleleyo, ukumelana nokuhamba okuphakathi kumjelo womzimba wevalvu kuphantse kube yi-0, ngoko ke ivalvu yesango iya konga kakhulu ukuvula nokuvala, kodwa isango likude kakhulu kumphezulu wokutywina, kwaye ixesha lokuvula nokuvala lide.

4 Ukufakwa kunye nesikhokelo sokuhamba kwamanzi

Ivalvu yesango inesiphumo esifanayo kuzo zombini iindlela, kwaye akukho mfuneko yemiyalelo yokungena kunye neyokuphuma ngexesha lokufakwa, kwaye i-medium ingahamba kuzo zombini iindlela. Ivalvu yokumisa kufuneka ifakwe ngqo kwicala lophawu lomtolo emzimbeni wevalvu. Kukwakho nomgaqo ocacileyo kwimiyalelo yokungena kunye neyokuphuma yevalvu yokumisa. Ivalvu yelizwe lam ethi "three-in-one" ichaza ukuba icala lokuhamba kwevalvu yokumisa lihlala lisuka phezulu ukuya ezantsi.

Ivalvu yokumisa inendlela yokungena ephantsi kwaye inendlela yokuphuma ephezulu, kwaye ngaphandle kuyacaca ukuba umbhobho awukho kumgca omnye othe tye. Umjelo wokuhamba kwevalvu yesango ukwimgca omnye othe tye. Ukubetheka kwevalvu yesango kukhulu kuneyo yevalvu yokumisa.

Ngokwembono yokumelana nokuhamba kwamanzi, ivalvu yesango inokumelana nokuhamba kwamanzi okuncinci xa ivuliwe ngokupheleleyo, kwaye ivalvu yokujonga inokumelana nokuhamba kwamanzi okukhulu. I-coefficient yokumelana nokuhamba kwamanzi yevalvu yesango eqhelekileyo imalunga ne-0.08 ~ 0.12, amandla okuvula nokuvala amancinci, kwaye i-medium inokugeleza kumacala amabini. Ukumelana nokuhamba kwamanzi kweevalvu zokumisa eziqhelekileyo kuphindwe kathathu ukuya kahlanu kuneevalvu zesango. Xa kuvulwa naxa kuvalwa, kufuneka kuvalwe ngokunyanzelekileyo ukuze kufunyanwe ukutywinwa. Ingaphakathi levalvu yevalvu yokumisa linxibelelana nomphezulu wokutywinwa kuphela xa ivaliwe ngokupheleleyo, ngoko ke ukuguguleka komphezulu wokutywinwa kuncinci kakhulu. Ekubeni amandla amakhulu okugeleza kwamanzi emkhulu, ivalvu yokumisa efuna i-actuator kufuneka iqwalasele ukulungiswa kwendlela yokulawula i-torque.

Kukho iindlela ezimbini zokufaka ivalvu yokumisa. Enye kukuba i-medium ingangena isuka ezantsi kwe-valve core. Inzuzo kukuba ukupakisha akukho phantsi koxinzelelo xa ivalvu ivaliwe, nto leyo enokwandisa ubomi benkonzo yokupakisha, kwaye ukupakisha kunokutshintshwa xa umbhobho ophambi kwevalvu uphantsi koxinzelelo; ingxaki kukuba i-torque yokuqhuba yevalvu inkulu, ephantse ibe yi-1 ngaphezu kokuhamba ukusuka phezulu, kwaye amandla e-axial kwi-valve stem makhulu, kwaye i-valve stem kulula ukuyigoba. Ke ngoko, le ndlela iqheleke kuphela kwiivalvu zokumisa ezincinci (ngaphantsi kwe-DN50), kwaye iivalvu zokumisa ezingaphezulu kwe-DN200 zisebenzisa indlela ye-medium ephuma phezulu. (Iivalvu zokumisa zombane zihlala zisebenzisa indlela ye-medium ephuma phezulu.) Ingxaki yendlela ye-medium ephuma phezulu ichasene ngqo nendlela yokungena isuka ezantsi.